/**
 * Copyright 2005 The Apache Software Foundation
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hadoop.mapred;

import java.io.IOException;
import java.io.File;

import org.apache.hadoop.fs.FileSystem;

import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.MapFile;

/**
 * An {@link InputFormat} for {@link SequenceFile}s.
 */
public class SequenceFileInputFormat extends InputFormatBase {

    public SequenceFileInputFormat() {
        setMinSplitSize();
    }

    @Override
    protected File[] listFiles(FileSystem fs, JobConf job)
            throws IOException {

        File[] files = super.listFiles(fs, job);
        for (int i = 0; i < files.length; i++) {
            File file = files[i];
            if (file.isDirectory()) {                   // it's a MapFile
                files[i] = new File(file, MapFile.DATA_FILE_NAME); // use the data file
            }
        }
        return files;
    }

    @Override
    public RecordReader getRecordReader(FileSystem fs, FileSplit split,
                                        JobConf job, Reporter reporter)
            throws IOException {

        reporter.setStatus(split.toString());

        return new SequenceFileRecordReader(job, split);
    }

}

